Injector



June 12, 1923.

vc. A. DAWLEY INJECTOR Filed March 25, 1921 INVENTOR Cums/vafl. Dawus/ ATTORNEYS Patented June 12, 1923.

CLARENCE A. DAWLEY, 0F IPLAINFIELD, NEW JERSEY.

. INJECTOR.

Application ma March 25, 1921. swarm. 455,671.. I

ple, rugged and efficient injectorconstruction adapted to various utilities, but especially designed in the construction shown and described for utility as a blower, This embodiment of my invention is shown in the accompanying drawings, in which- I Fig. 1 is a side elevation of a portable forge to which is attached a blower in which my invention is embodied; a

Fig. 2 is'a vertical section through the blower; and 1 Fig. 3 is a section on the line 3-3, F ig. 2. As here illustrated, my invention is applied :to a blower fora portable forge 5,, such asis commonly used for heating rivets prepartory to insertion and heading up, steel tools preparatory .to sharpening or tempering, and for other purposes. In its main features the device comprises a blast tube 6 flaring towardv its discharge end, which may be tapped at 7 for attachment to'a pipe 8 or other passageway leading, inthis instance, to the wind-box of the forge. At its opposite end the blast tube 6 is bell mouthed, the flaring walls 9 being connected at suitablepoints by integral webs 10 with the easing 11 of the pressure chamber 12. Also integral with the'latteris'a nipple 13 tapped at 15% to receive the end of the inlet pipe '15,

by which pressure fluid, for example compressed air, is led to the-blower.

A valve chamber 16 is interposed between I the inlet nipple .13 and the pressure cham- 1. her 12, the coned port 17 and passage 18 the pressure chamber. Cooperating with the. port 17 is aneedle valve 20, the stem of which is pinned, or otherwise secured tothe thumb screw 21 threaded into the upward extension 22'of the casing 11. A guide disk, 23 for the valvestem is also securedin' the upward extension 22 of the casingll, and is v:

seated against the shoulder.2l,'while a pack-Q ing ring 25 surrounding the valve stem rests againstv the inner face of theidisk andiside' wall of the neck, and is held in position by the compressed air in the valve chamber 16.

The packing ring is preferably of channel section, as indicated, somewhat after the fashion'of apistonpacking. The space he tween the outer face of the disk 23 and the body of the thumb screw 21 is preferably filled with lubricant to enable thevalv'e stem' to work readily in its" passageway through the disk andpacking, and also to keep the threads of the .thumb screw from rusting.

A stop pin 26 maybe screwed through the I wall of the extension 22 to prevent the thumb screw from being turned out too far. NVithin the pressure chamber 12, and extending. from oneend to the other thereof, b

is a tubular screen 27,- the ends of which, to hold the screeninplace, are preferably expanded, one in the neck in which the plug l9 is seated, and the other in the bottom opening 28 to the pressure chamber. The latter-opening is normally sealed by the screw plug 29, which may,-=however,1 be removed to permit the screen to be cleaned, for example, by opening wide the valve 20 to permit the pressure fluid to sweep the dirt accumulations from the inner face of:

the screen out through the bottom opening.

Dirt may accumulateto' a considerable flow through the screen, which thus forms a settling chamber. It will; be noted =fur V as depth in the plug without seriously affecting fluid discharged through the nozzle from the pressure chamber 12. The high pressure jet escaping from the nozzle entrains with it into the blast tube 6 a large amount of free air, which enters at openings between the Webs 10. This free air is guided by the bell mouth 9 to the constricted throat 32 of the blast tube, and the energy due to the velocity of the high pressure jet is imparted to the free air entering at the bell mouth so that the pressure of the combined mixture of high pressure gases and free air is materially above that of the atmosphere. In order to secure a high ratio of volume of air induced, to the volume of high pressure air admitted through the nozzle, it is nec indicated by the arrows in Fig. 3.

essary to correctly proportion the nozzle duct 31 to the diameter of the blast tube 6, and also to provide asmooth stream line flow for the induced air entering the tube The stream line flow of the induced air is From the throat 32 of the blast tube the flow gradually diverges, and the velocity of the gases is further converted into static pressure, availablein the forge or other device to which the discharge end of the tube is connected.

It will be noted from Fig. 3 that there are two converging streams of air limited by the circular wall of the'pressure' chamber portion of the casting on the one hand, and by the edges of the bell mouth 9 of the discharge tube, on the other hand. The tie webs 10 prevent inrush of air from the top and bottom of the bell mouth, which would otherwise tend to set up eddy currents and create turbulence in the stream line flows to opposite sides of the bell mouth. The construction results in. a flow of two parallel horizontal strata of air into the bell mouth. At this point they are brought within the influence of the jet for the nozzle 30, which unites them and causes them to converge at a higher velocity in the throat 32 of the discharge pipe 6. From 32 the flow gradually diverges, permitting the velocity to be converted into static pressure available in the forge or other device to which the free end of the discharge tube is connected.

While I have indicated the device in its use as a forge blower, the invention is obviously applicable to other uses. Fo example, it may be used as a gas mixer for combustion purposes, the gas being led under pressure to the pressure chamber 10, and the air to support combustion being admitted by induction at the bell mouth leading to the tube 6. Again it may be used for ventilation, or for the removal of fumes or dust. The tube 6 may be left open at its discharge end and steam admitted from the pressure chamber, in which case the device may act as a humidifier. With suitable modifications of proportions, it may be used as an oil burner. Various other uses will readily occur to those skilled in the art, and of course details of construction are susceptible to various modifications without departing from what I claim as my invention.

I claim 1. A device of the type described, comprising a casting cored to afford an elongated pressure chamber, a perforated screw plug at the inlet end of said chamber, a screw plug at the opposite end of the chamher, a cylindrical screen engaged between said plugs and surrounding the perforation in the inlet plug, a nozzle screwed in the side wall of said pressure chamber, and a discharge tube integral with the pressure chamber and spaced therefrom by tie webs, said tube lying substantially at right angles to the pressure chamber and coaxial with the laterally projecting nozzle.

2. An injector comprising a low pressure blast tube, an elongated pressure chamber I having its axis substantially at right angle to the axis of the blast tube but in the plane of the latter, a perforated screw plug at the inlet end of said chamber, a screw plug at the opposite end of thechamber, a cylindri-f cal screen engaged between said plugsand surrounding the perforation in the inlet plug and a nozzle in the side wall of said pressure chamber substantially coaxial with the lOW pressure blast tube.

3. An injector comprising a low pressure blast tube, an elongated pressure chamber supported by tie webs affording passage for free air to enter the mouth of the blast tube, a perforated plug at the inlet end. of said chamber, a screw plug at the opposite end of the chamber, a cylindrical screen engaged between said plugs and surrounding the perforation in the inlet plug, a lateral opening in the side of the pressure chamber, and'a high pressure jet nozzle in saidopening in substantial alignment with the axis of they blast tube.

4. A device of the type described, comprisingan elongated pressure chamber, a plug at the inlet end of said chamber havinga port therethrough, a valve controlling the port of said plug, a high pressure jet nozzle opening from the pressure chamber and a low pressure blast tube mounted coaxially with said jet nozzle.

5. A device of the type described, com-'' prising a low pressure blast tube, a pressure; chamber connected thereto but spaced fromthe blast tube to aiford free air passages to the mouth of the blast tube, a ported plug at the inlet end of the pressure chamber, avalve controlling the port of said plug, a plug closing the opposite end of said chamher, a cylindrical screen engaged between said plugs and surrounding the portof the first plug, a high pressure jet nozzle open-- ing from the pressure chamber and having its axis substantially in alignment with that of the low pressure blast tube.

6. An injector comprising'a low pressure blast tube of relatively great diameter, an

elongated high pressure chamber of relatively small diameter, and arranged With its axis substantially at right angles to the axis of the blast tube, tie Webs integral with the blast tube and pressure chamber and render- 10 ing said structure unitary, a jet nozzle opening from-the pressure chamber tothe blast tube and substantially coaxial withthe lat- I I ter, a valve mounted on and controlling the, v. inlet to the high pressure chamber, together with a screen interposed between-the valve and the jet nozzle.

In testimony whereof I have signed my name to'this specification.

CLARENCE A. DAWLEY, 

